What is AC content in asphalt?
AC% = The measured (corrected) asphalt content percent by mass of the HMA sample. WA = The total mass of aggregate remaining after ignition. WS = The total mass of the HMA sample prior to ignition.
What is the compressive strength of asphalt?
Most pavement PCC has a compressive strength between 20.68 and 34.47 MPa (3000 and 5000 psi) (ACPA, 2001). High-strength PCC (usually defined as PCC with a compressive strength of at least 41.37 MPa (6000 psi)) has been designed for compressive strengths of over 137.90 MPa (20,000 psi) for use in building applications.
How is asphalt compaction measured?
The most common method is a Nuclear Density Gauge. The gauge measures compaction as the pavement is placed. Therefore, a technician can tell the roller operator if additional compaction is needed. Once the pavement is placed, core samples with laboratory analysis can also be performed to confirm the compaction levels.
What is the compaction rate of asphalt?
Remember, the compaction rate, as a general rule, is about 6 mm (1/4″) per 25 mm (1″) of screed laid thickness when a vibratory screed is used and about 5 mm (1/5″) per 25 mm (1″) when a tamping and vibrating screed is used. Always verify the compaction rate of the fresh layer when building a longitudinal joint.
What is 19mm asphalt?
Asphalt Paving ‐ 19mm Binder Course 19mm Binder Course is applied in one layer, is as strong as regular base and has a sufficient amount of liquid asphalt to roll into a very durable surface. The difference is that the texture is coarser than 9.5mm Wearing Course.
How do you calculate unit weight of asphalt?
Standard density for asphalt is 145 lb/ft3 (2322 kg/m3). Multiply the volume by the density (in the same units) to get the weight.
How do you measure asphalt?
- Use a tape measure to determine distances.
- Convert the length, width and height measurements to feet by dividing by 12, since each foot contains 12 inches.
- Multiply the length times the width times the depth to obtain the volume in cubic feet of the space to be paved.
What is SM 9.5 a asphalt?
SM-9.5 This mix is a ‘fine’ to ‘medium’ (3/8 inch (9.5 mm) nominal maximum aggregate size) surface mix generally placed at 1½ inches (40 mm) thickness. SM-9.5 mixes usually result in low water permeability values. This mix tends to be less susceptible to segregation than the SM-12.5 mix type described below.
What is the volume of asphalt?
Multiply the length times the width times the depth to obtain the volume in cubic feet of the space to be paved. Performing this step yields 12.5 feet times 8.33 feet times 0.42 feet or 43.7 cubic feet.
What is 225 cube test?
Cross-Sectional Area – 15 x 15 = 225 Sqcm. Compressive Strength = (375 x 1000/225) = 1666/9.81 = 169.82 Kg/Sqcm.
Is cement cheaper than asphalt?
Cost. The cost of an asphalt driveway is typically cheaper than concrete, costing $2.00 – $4.00 per square foot. Asphalt prices tend to fluctuate with fluctuations in crude oil prices. In contrast, a concrete driveway costs between $4.00 – $6.00 per square foot for a standard installation.
What is the maximum unit weight of asphalt?
The maximum unit weight is sometimes called the “solid density”. This value is based on the asphalt mixture’s maximum specific gravity – also known as the Rice value or G mm in Superpave. The maximum unit weight is determined by multiplying the Rice value by 62.4 pounds per cubic foot (PCF).
What is the best way to dissolve asphalt?
Any excess amount will dissolve the asphalt films on the aggregate particles, thus contaminating the mix. Commercial mix release agents are readily available and should be used. They generally are soap or emulsified wax or other stick-resistant materials that do not contaminate the mix.
What particle size should I use for asphalt?
Highly skilled crews could also use an AC-5 or 10. The average particle size of the chips. Allowance should be made for surface conditions – dry, pocked, badly cracked, flushed, bleeding, etc. Lower traffic volumes require higher asphalt applications than higher traffic. The average particle size should be embedded 60-75% into the asphalt.
How much residual asphalt do I put on my driveway?
You want to accomplish a very uniform application of about 0.03 to 0.05 gal/sy of residual asphalt on the layer to be tacked (a paint job, so to speak). Slow-setting emulsions generally have a residual asphalt content of about 2/3. Therefore, an application rate of 0.10 to 0.15 gals/sy of the diluted material will give you the 0.03 to 0.05 gals/sy.